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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d354c79e89680d65d0d675e8a1069a65d06a5a5d1afaf32572d0e35cd2d2814' 
  AND token = 'ihHCu9jOo1Yj1lcPjos8wMnlDWO7rJo8kkg1cy1PRXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}